Process for dyeing cellulose acetate silk



Patented n. 10,1929

UNITED STATES PATENT OFFICE RICHARD METZGER, OF HEDELBERG, GERMANY,ASSIGNOR TO GENERAL A'NILINE WORKS, INC., 015' NEW YORK, N. Y.

, A CORPORATION OF DELAWARE PROCESS FOR D'Y EING OELLULOSE AOETATE SILKHo Drawing. original application filed 1111 7 7, 1925, Serial No.42,046, and in Germany July 11, 1924. Divided and this application filedSeptember 27, 1927. Serial No. 222,397.

This application contains subject matter, which has been deleted from mycopending application for Letters Patent, Ser. No. 42,046, filed July 7,1925, with the express.

intention of filing this divisional application. I

The present invention has for its object to provide for an improvedprocess for dye-' ing cellulose acetate silk.

I have-found that cellulose acetate silk can 10 be dyed in a veryexcellent and improved manner with a great number of insoluble ordiificulty soluble compounds when dyeing is carried out in the presenceof sulfonated mineral oils which constitute mixtures of differentsulfonic acids. 1

The compounds which dye with the aid of the aforesaid sulfonated mineraloils may be coloring matters or colored organic compounds in general,-insoluble or diificultly g0 soluble in water, as well as components ofdyestufi's, such for example as amino compounds which afterwards arediazotized on the fibre and coupled with suitable components, ornapthols or similar components which afterwards are to be developed withdiazo compounds.

' For dyeing, the'compounds to be brought on the fibre may be first madeinto a concentrated solution or paste, 'enerally' of a colloidal nature,or otherwise ely dispersed in a concentrated form by an addition of.sulfonated mineral oils either alone or in association with one or moreof the so-called synthetic tans of the nature of phenol- (.or cresol-)formaldehyde-sulfuric acid condensation products or phenol-"sulfonicacid-sulfur condensation products, carbazol sulfonic acids, crudeanthracene or other high tar hydro-carbon sulfonic acids, or sulfite'cellulose waste liquor and the like, and a dye-bath; prepared bydiluting such concentrated preparations', or the dye-bath may bedirectly prepared with the compounds to be brought on the fibre whileadding a sulfonated mineral oil, either alone or with the addition of asulfonic acid of the aforesaid character.

As examples of coloring matters difiicultly soluble in water, which maybe employed for' dyeing cellulose acetate silk inthe manner 56heteinbefore described may be mentioned,

for instance, the condensation product of3-chlor-6-nitro-1-amino-benzene and formaldehyde (see U. S. Patent932,266 dated August 22, 1909), 1.4 diamino-anthraquinone1.4.5.8-tetra-amino anthraquinone, 3 s amino benzanthrone, Bz l-aminobenzanthrone corresponding -to the formula Ewample '15 One third of anounce of 1.4.5.8-tetraamino-anthraquinone is dissolved in sulfonatedmineral lubricating oil (in neutralized form) and diluted with about 5gallons of water. 2 lbs. of cellulose acetate silk are dyed with thisbath for three quarters of an hour at between 60 and 70 C. whereby abeautiful bright blue is produced.

What I claim is:

1. The process of producing dyeings on cellulose acetate silk, whichcomprises emplaying a substance, suitable for dyeing cellulose acetatesilk, diflicultly soluble in water. inl conjunction with a sulfonatedmineral or r 2. The process of producing dyeings on cellulose acetatesilk, which comprises employing a colored organic substance practicallyinsoluble in water and suitable for dyeing cellulose acetate silk, inconjunction with a sulfonated mineral oil. 1

3. As a new article of manufacture, a preparation comprising, asubstance diflicultly soluble in water and suitable for dye-, 100

-my hand.

ing cellulose acetate silk in admixture with a sulfonated mineral oil. e

4. As a new article of manufacture, a pre aration comprising a coloredorganic su stance difliculfly soluble in water and suif;'-' able fordyeing ceHulose acetate-silk in ad mixture with a sulfonated mineral 0if In testimony whereof I have hereunto set RICHARD MIETZGER.

